WO2023035541A1 - 电极组件、电池单体、电池以及用电装置 - Google Patents

电极组件、电池单体、电池以及用电装置 Download PDF

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Publication number
WO2023035541A1
WO2023035541A1 PCT/CN2022/073265 CN2022073265W WO2023035541A1 WO 2023035541 A1 WO2023035541 A1 WO 2023035541A1 CN 2022073265 W CN2022073265 W CN 2022073265W WO 2023035541 A1 WO2023035541 A1 WO 2023035541A1
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WIPO (PCT)
Prior art keywords
pole piece
separator
electrode assembly
spacer
isolation layer
Prior art date
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PCT/CN2022/073265
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English (en)
French (fr)
Chinese (zh)
Inventor
郭锁刚
付成华
叶永煌
张辰辰
常雯
朱畅
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP22866021.3A priority Critical patent/EP4325623A1/en
Priority to JP2023543459A priority patent/JP2024503520A/ja
Priority to KR1020237024948A priority patent/KR20230121906A/ko
Priority to CN202280005318.1A priority patent/CN116114095A/zh
Publication of WO2023035541A1 publication Critical patent/WO2023035541A1/zh
Priority to US18/353,679 priority patent/US20230361429A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H01M50/491—Porosity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of battery technology, and more specifically, relates to an electrode assembly, a manufacturing method and system thereof, a battery cell, a battery, and an electrical device.
  • Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • the battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.
  • the present application provides an electrode assembly, a manufacturing method thereof, a manufacturing system, a battery cell, a battery and an electrical device, which can improve safety.
  • the embodiment of the present application provides an electrode assembly, including a first pole piece, a second pole piece and a first separator, the polarity of the first pole piece and the second pole piece are opposite, and the first separator uses To separate the first pole piece and the second pole piece, the first pole piece, the second pole piece and the first separator are wound along the winding direction.
  • the electrode assembly has a bending area, the bending area is provided with a second separator, the second separator is stacked with the first separator and is used to separate the adjacent first pole piece and the second pole piece; at least Part of the ions can pass through the first separator and the second separator and be embedded in the second pole piece.
  • the first separator and the second separator jointly separate the first pole piece and the second pole piece in the bending area, even if there is a problem of lithium deposition in the bending area, or the pole piece is in the process of bending Burrs are generated, and it is difficult for lithium dendrites or burrs to pierce the first separator and the second separator at the same time, thereby reducing the probability of conduction between the first pole piece and the second pole piece, and effectively reducing the damage of the electrode assembly due to the separator.
  • the resulting short circuit problem can effectively reduce the risk of failure of the electrode assembly and improve the service life and safety of the electrode assembly.
  • Both the first separator and the second separator can permeate ions, which can reduce the barrier to ions and ensure the capacity of the electrode assembly.
  • the thickness of the second spacer is greater than the thickness of the first spacer.
  • the second spacer is more difficult to be punctured than the first spacer, which can effectively reduce the risk of damage to the second spacer and improve safety.
  • the second spacer includes a plurality of spacer layers stacked in a thickness direction of the second spacer.
  • the multi-layer structure can increase the strength of the second spacer, increase the difficulty of the second spacer being punctured, and improve safety.
  • adjacent barrier layers are bonded to each other.
  • a plurality of isolation layers are bonded together, which can reduce the risk of offset between the plurality of isolation layers during the winding process of the electrode assembly, and ensure the protective effect of the second separator in the bending area .
  • the plurality of isolation layers includes a first isolation layer and a second isolation layer disposed adjacently, and the first isolation layer is located between the second isolation layer and the first isolation member. In the winding direction, the end of the second isolation layer is dislocated from the end of the first isolation layer.
  • the end of the second isolation layer and the end of the first isolation layer are dislocated, so that the end of the second isolation layer and the end of the first isolation layer can be pressed against different regions of the pole piece, Reduce stress concentration, reduce the risk of pole piece cracking, and improve the performance of the pole piece.
  • both ends of the second isolation layer protrude from the first isolation layer and are attached to the first isolation member in the winding direction.
  • the second separator is attached to the first separator, and can restrict the movement of the first separator in the winding direction, so that the first separator and the second separator can be lowered during the charging and discharging process.
  • the risk of deviation and dislocation along the winding direction ensures the protective effect of the second spacer in the bending area and improves safety.
  • the electrode assembly further includes a straight region connected to the bent region.
  • the whole of the first isolation layer is located in the bending area.
  • the two ends of the second isolation layer along the winding direction are located in the straight region.
  • the first isolation layer and the second isolation layer can simultaneously play a protective role in the bending area, so as to reduce the risk of short circuit and improve safety.
  • the first isolation layer is entirely located in the bending area, so that the first isolation layer can prevent the ion transmission in the flat area from being affected, and ensure the charging and discharging performance of the flat area.
  • the two ends of the second isolation layer along the winding direction are located in the straight region, so that the end of the second isolation layer can be dislocated from the end of the first isolation layer, and stress concentration can be reduced.
  • the first isolation layer is attached to the first isolation member.
  • the above implementation manner can reduce the risk of offset and dislocation of the first isolation layer along the winding direction, ensure the protective effect of the first isolation layer in the bending area, and improve safety.
  • the material of the isolation layer is the same as that of the first isolation member, and the thickness of the isolation layer is equal to the thickness of the first isolation member.
  • the first spacer and the second spacer can be made of spacers of the same specification, which can simplify the process and reduce the cost.
  • the porosity of the second spacer is greater than or equal to the porosity of the first spacer.
  • the second separator has better ion permeability, so as to reduce the barrier of the second separator to ions and ensure the capacity of the electrode assembly.
  • At least a second spacer is provided between the innermost adjacent first pole piece and the second pole piece.
  • the above embodiment can set the second separator in the area where the problem of lithium analysis is serious, so as to effectively reduce the short circuit problem of the electrode assembly caused by the damage of the separator, and improve the service life and safety of the electrode assembly.
  • a plurality of second separators are provided in the bending region, and adjacent second separators are separated by the first pole piece or the second pole piece. Among the adjacent second spacers, the thickness of the inner second spacer is greater than the thickness of the outer second spacer.
  • the inner second spacer has a greater thickness to minimize the risk of being punctured; the outer second spacer has a low risk of being punctured, so it can have a smaller thickness , so as to save the usage amount of the second separator and improve the energy density of the electrode assembly.
  • the electrode assembly further includes a straight region connected to the bent region, and both ends of the second separator along the winding direction are located in the straight region.
  • the second spacer can completely separate the first pole piece from the second pole piece, so as to improve safety.
  • the second spacer is attached to the outer surface of the first spacer.
  • the second separator is attached to the outer surface of the first separator, which can reduce the risk of the second separator being shifted and dislocated along the winding direction during the charging and discharging process, and can also make the second separator
  • the spacer stretches under the action of the first spacer to reduce the risk of creasing the second spacer.
  • the second pole piece is a negative pole piece
  • the second separator is attached to the outer surface of the second pole piece.
  • the second separator is attached to the outer surface of the second pole piece, and the second separator is stretched under the action of the second pole piece, so that the risk of wrinkles of the second separator can be reduced.
  • an embodiment of the present application provides a battery cell, including a casing and the electrode assembly according to any embodiment of the first aspect, and the electrode assembly is housed in the casing.
  • the embodiment of the present application provides a battery, including a plurality of battery cells according to the second aspect.
  • an embodiment of the present application provides an electric device, including the battery cell according to the second aspect, and the battery cell is used to provide electric energy.
  • the embodiment of the present application provides a method for manufacturing a battery assembly, including:
  • the polarity of the first pole piece and the second pole piece are opposite, and the first separator is used to separate the first pole piece and the second pole piece;
  • the separators are laminated and used to separate adjacent first and second pole pieces; at least part of the ions released from the first pole piece can pass through the first and second separators and be embedded in the second pole piece.
  • the embodiment of the present application provides a battery assembly manufacturing system, including a supply device and a winding device.
  • Means are provided for providing a first pole piece, a second pole piece, a first spacer and a second spacer.
  • the winding device is used to wind the first pole piece, the second pole piece and the first separator along the winding direction, and form the bending area.
  • the polarity of the first pole piece and the second pole piece are opposite, and the first spacer is used to separate the first pole piece and the second pole piece; the second spacer is provided in the bending area, and the second spacer and the first spacer stacked and used to separate the adjacent first pole piece and the second pole piece; at least part of the ions released from the first pole piece can pass through the first spacer and the second spacer and be embedded in the second pole piece.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • Fig. 3 is a schematic explosion diagram of a battery cell provided by some embodiments of the present application.
  • Fig. 4 is a schematic structural diagram of an electrode assembly provided by some embodiments of the present application.
  • FIG. 5 is a partially enlarged schematic diagram of the electrode assembly shown in FIG. 4;
  • Fig. 6 is a partial structural schematic diagram of an electrode assembly provided by another embodiment of the present application.
  • FIG. 7 is a schematic diagram of a partial structure of an electrode assembly provided in some other embodiments of the present application.
  • FIG. 8 is a schematic diagram of a partial structure of an electrode assembly provided in some further embodiments of the present application.
  • Fig. 9 is a schematic flowchart of a method for manufacturing a battery assembly provided by some embodiments of the present application.
  • Fig. 10 is a schematic block diagram of an electrode assembly manufacturing system provided by some embodiments of the present application.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • Multiple appearing in this application refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two groups), and “multi-piece” refers to more than two (Includes two pieces).
  • the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc.
  • the embodiment of the present application does not limit this.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer, The current collector not coated with the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer, The current collector not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the spacer can be PP (polypropylene) or PE (polyethylene).
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the separator has electronic insulation, and it is arranged between the positive pole piece and the negative pole piece, and its main function is to prevent the positive pole piece and the negative pole piece from contacting, thereby causing an internal short circuit of the electrode assembly.
  • the separator has a large number of penetrating micropores, which can ensure the free passage of electrolyte ions.
  • the separator has good permeability to lithium ions.
  • the spacer includes an isolation base layer and a functional layer located on the surface of the isolation base layer.
  • the isolation base layer can be at least one of polypropylene, polyethylene, ethylene-propylene copolymer, polybutylene terephthalate, etc., and the function
  • the layer may be a mixture layer of ceramic oxide and binder.
  • the separator occupies a very important position in the electrode assembly, which can directly lead to short circuit, performance and life reduction of the electrode assembly.
  • metal ions are extracted from the positive electrode active material layer and inserted into the negative electrode active material layer, but some abnormalities may occur, resulting in the precipitation of metal ions.
  • the extracted lithium ions cannot wait.
  • a large amount of negative electrode active material layer embedded in the negative electrode sheet the lithium ions that cannot be embedded in the negative electrode sheet can only get electrons on the surface of the negative electrode sheet, thereby forming a simple metal lithium, which is the phenomenon of lithium precipitation.
  • the inventor also found that the winding-type electrode assembly is more prone to lithium deposition in its bending area.
  • the reason for the lithium deposition phenomenon is mainly because it is located in the bending area.
  • the positive pole piece and the negative pole piece need to be bent, and the positive active material layer and the negative active material layer are prone to stress concentration during the bending process and cause the respective active materials to fall off. Due to the shedding of the active material, especially the shedding of the active material on the negative electrode sheet, the lithium intercalation sites of the negative electrode active material layer of the negative electrode sheet may be less than the lithium ions that can be provided by the positive electrode active material layer of its adjacent positive electrode sheet. amount, thus triggering the phenomenon of lithium precipitation.
  • the extracted lithium ions can form lithium crystals on the surface of the negative electrode sheet; and because the separator is thin, the lithium crystals are easy to pierce the separator, causing the risk of short circuit between the adjacent positive electrode sheet and the negative electrode sheet. cause safety hazards.
  • the separator is easy to be punctured under the action of large stress, which makes the electrode assembly short circuit. In turn, it is easy to cause thermal runaway phenomena such as fire and explosion of the battery cell.
  • the inventors of the present application have proposed an electrode assembly, which increases the number of layers of separators in the bending area, thereby reducing the probability of damage to the separators in the electrode assembly, and reducing the The risk of internal short circuit of the pole piece increases the service life and safety.
  • the electrode assembly described in the embodiments of the present application is suitable for battery cells, batteries, and electrical devices using batteries.
  • Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiment of the present application does not impose special restrictions on the above-mentioned electrical devices.
  • the electric device is taken as an example for description.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 .
  • the battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .
  • the vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.
  • the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • the battery 2 includes a case body 5 and a battery cell 6 , and the battery cell 6 is accommodated in the case body 5 .
  • the box body 5 is used to accommodate the battery cells 6, and the box body 5 may have various structures.
  • the box body 5 may include a first box body part 51 and a second box body part 52, the first box body part 51 and the second box body part 52 cover each other, the first box body part 51 and the second box body part 51
  • the two box parts 52 jointly define an accommodating space 53 for accommodating the battery cells 6 .
  • the second box part 52 can be a hollow structure with one end open, the first box part 51 is a plate-shaped structure, and the first box part 51 covers the opening side of the second box part 52 to form an accommodating space 53
  • the box body 5; the first box body portion 51 and the second box body portion 52 also can be a hollow structure with one side opening, and the opening side of the first box body portion 51 is covered on the opening side of the second box body portion 52 , to form a box body 5 with an accommodation space 53 .
  • the first box body part 51 and the second box body part 52 can be in various shapes, such as a cylinder, a cuboid, and the like.
  • a sealing member may also be provided between the first box body portion 51 and the second box body portion 52, such as sealant, sealing ring, etc. .
  • the first box part 51 covers the top of the second box part 52
  • the first box part 51 can also be called an upper box cover
  • the second box part 52 can also be called a lower box.
  • battery 2 there are a plurality of battery cells 6 .
  • the plurality of battery cells 6 can be connected in series, in parallel or in parallel.
  • the mixed connection means that the plurality of battery cells 6 are both connected in series and in parallel.
  • a plurality of battery cells 6 can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells 6 is contained in the box body 5; of course, a plurality of battery cells 6 can also be connected in series first Or parallel or mixed connection to form a battery module, multiple battery modules are then connected in series or parallel or mixed to form a whole, and accommodated in the box 5 .
  • FIG. 3 is an exploded schematic diagram of a battery cell provided by some embodiments of the present application.
  • the battery cell 6 refers to the smallest unit constituting the battery 2 .
  • the battery cell 6 includes a casing, an electrode assembly 100 and other functional components, and the electrode assembly 100 is accommodated in the casing.
  • the housing includes an end cap 61 and a housing 62 .
  • the end cap 61 refers to a component that covers the opening of the casing 62 to isolate the internal environment of the battery cell 6 from the external environment.
  • the shape of the end cap 61 can be adapted to the shape of the housing 62 to fit the housing 62 .
  • the end cap 61 can be made of a material (such as aluminum alloy) with a certain hardness and strength, so that the end cap 61 is not easy to deform when being squeezed and collided, so that the battery cell 6 can have a higher Structural strength and safety performance can also be improved.
  • Functional components such as electrode terminals may be provided on the end cap 61 . The electrode terminals can be used for electrical connection with the electrode assembly 100 for outputting or inputting electric energy of the battery cells 6 .
  • the end cover 61 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 6 reaches a threshold value.
  • the material of the end cap 61 may also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application.
  • an insulator can also be provided inside the end cover 61 , and the insulator can be used to isolate the electrical connection components in the housing 62 from the end cover 61 to reduce the risk of short circuit.
  • the insulating member may be plastic, rubber or the like.
  • the casing 62 is a component for matching with the end cap 61 to form the internal environment of the battery cell 6 , wherein the formed internal environment can be used to accommodate the electrode assembly 100 , electrolyte and other components.
  • the housing 62 and the end cover 61 can be independent components, and an opening can be provided on the housing 62 , and the internal environment of the battery cell 6 can be formed by making the end cover 61 cover the opening at the opening.
  • the end cover 61 and the housing 62 can also be integrated.
  • the end cover 61 and the housing 62 can form a common connection surface before other components are inserted into the housing. When the inside of the housing 62 needs to be encapsulated , then make the end cover 61 cover the housing 62 .
  • the housing 62 can be in various shapes and sizes, such as cuboid, cylinder, hexagonal prism and so on. Specifically, the shape of the casing 62 may be determined according to the specific shape and size of the electrode assembly 100 .
  • the housing 62 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application.
  • the electrode assembly 100 is a part of the battery cell 6 that is soaked in an electrolyte solution to undergo an electrochemical reaction.
  • One or more electrode assemblies 100 may be contained within the housing 62 .
  • the electrode assembly 100 is mainly formed by winding a positive pole piece and a negative pole piece, and a separator is usually provided between the positive pole piece and the negative pole piece.
  • the parts of the positive pole piece and the negative pole piece with the active material constitute the main body of the electrode assembly 100 , and the parts of the positive pole piece and the negative pole piece without the active material respectively form tabs.
  • the positive pole tab and the negative pole tab can be located at one end of the main body together or at two ends of the main body respectively.
  • the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.
  • FIG. 4 is a schematic structural view of an electrode assembly provided by some embodiments of the present application
  • FIG. 5 is a partially enlarged schematic view of the electrode assembly shown in FIG. 4 .
  • the electrode assembly 100 of the embodiment of the present application includes a first pole piece 110, a second pole piece 120 and a first separator 131, the polarity of the first pole piece 110 and the second pole piece 120
  • the first separator 131 is used to separate the first pole piece 110 and the second pole piece 120
  • the first pole piece 110 , the second pole piece 120 and the first separator 131 are wound along the winding direction X.
  • the electrode assembly 100 has a bending area B, and the bending area B is provided with a second separator 132, the second separator 132 is laminated with the first separator 131 and is used to separate the adjacent first pole piece 110 and the second pole piece 120 ; At least part of the ions released from the first pole piece 110 can pass through the first separator 131 and the second separator 132 and be embedded in the second pole piece 120 .
  • the winding direction X is the circumferential winding direction of the first pole piece 110 , the second pole piece 120 and the first separator 131 from inside to outside.
  • the winding direction X is counterclockwise.
  • One of the first pole piece 110 and the second pole piece 120 is a positive pole piece, and the other is a negative pole piece.
  • Both the first separator 131 and the second separator 132 have a large number of penetrating micropores, which can ensure the free passage of metal ions; for example, the first separator 131 and the second separator 132 have good permeability to lithium ions, Basically, it cannot block the passage of lithium ions.
  • the material of the first isolator 131 and the second isolator 132 may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the first spacer 131 and the second spacer 132 can be made of the same material or different materials. In this embodiment, the thicknesses of the first spacer 131 and the second spacer 132 are not limited.
  • the spacer mentioned in this application can also be called a spacer, which is represented by a line in the figure, but actually the spacer also has a thickness.
  • the first pole piece 110 , the second pole piece 120 and the first separator 131 are all strip-shaped structures. In some embodiments, two first separators 131 are provided, and the present application may first stack the first pole piece 110, one first separator 131, the second pole piece 120 and another first separator 131 in sequence, It is then wound more than two times to form a wound structure.
  • the winding equipment winds the first pole piece 110, the second pole piece 120, and the first separator 131 into several turns, and each turn can be constructed with several layers, and one turn refers to the number of layers on the electrode assembly 100.
  • a certain point is used as the starting point to start calculation, and one circle along the winding direction X reaches another point to locate the end end.
  • the end end, the starting end and the center of the circle are on a straight line, and the starting end is between the end end and the center of the circle.
  • Each circle includes the first pole piece layer, the first spacer layer, the second pole piece layer and the first spacer layer in turn, and the first spacer 131 is used to isolate the first pole piece layer of the adjacent circle or the adjacent layer in the same circle.
  • a pole piece 110 and a second pole piece 120 is used to isolate the first pole piece layer of the adjacent circle or the adjacent layer in the same circle.
  • the first separator 131 should be understood as a layer of separator between the first pole piece 110 and the second pole piece 120 in the related art, that is, the basic separator, and the second separator 132 should be understood as an increased separator, namely Additional spacers.
  • the electrode assembly 100 can be in various shapes, for example, the electrode assembly 100 can be in the shape of a cylinder, a flat body, a prism (such as a triangular prism, a quadrangular prism, or a hexagonal prism) or other shapes.
  • a prism such as a triangular prism, a quadrangular prism, or a hexagonal prism
  • Both the first pole piece 110 and the second pole piece 120 include a plurality of bending portions 150 located in the bending area B.
  • the bending area B is the area where the electrode assembly 100 has a bending structure, the part of the first pole piece 110 located in the bending area B (ie the bent portion 150 of the first pole piece 110 ) and the part of the second pole piece 120 located in the bending area Parts of the bending area B (ie, the bending portion 150 of the second pole piece 120 ) are all bent.
  • the bent portion 150 of the first pole piece 110 and the bent portion 150 of the second pole piece 120 are generally bent into an arc shape.
  • the bending region B may be provided with one second spacer 132 , or may be provided with multiple second spacers 132 .
  • the second separator 132 is stacked between the pole piece and the first separator 131 , wherein the pole piece can be the first pole piece 110 or the second pole piece 120 .
  • the second spacer 132 can be independently arranged between the pole piece and the first spacer 131, that is, the second spacer 132 is separately laminated with the pole piece and the first spacer 131, and the second spacer 132 and the pole piece and between the second separator 132 and the first separator 131 have no connection relationship such as adhesion.
  • the second spacer 132 can also be attached to the surface of the pole piece or to the surface of the first spacer 131; attaching refers to an adhesive connection, for example, the second spacer 132 can be attached to the surface of the first spacer 131; are attached to the pole piece or the first spacer 131 in a similar manner.
  • the second separator 132 may be located entirely in the bending area B of the electrode assembly 100 , or may be only partially located in the bending area B of the electrode assembly 100 .
  • the first spacer 131 and the second spacer 132 jointly separate the first pole piece 110 and the second pole piece 120 in the bending area B, even if the bending area B produces a problem of lithium deposition, or the pole piece
  • the burrs are generated during the bending process of the sheet, and lithium dendrites or burrs are also difficult to pierce the first separator 131 and the second separator 132 at the same time, thereby reducing the probability of conduction between the first pole piece 110 and the second pole piece 120 , effectively reducing the short circuit problem of the electrode assembly 100 caused by the damage of the separator, thereby effectively reducing the failure risk of the electrode assembly 100 and improving the service life and safety of the electrode assembly 100 .
  • Both the first separator 131 and the second separator 132 are permeable to ions, which can reduce the barrier to ions and ensure the capacity of the electrode assembly 100 .
  • the thickness of the second spacer 132 is greater than the thickness of the first spacer 131 .
  • the second spacer 132 is more difficult to be punctured than the first spacer 131 , which can effectively reduce the risk of damage to the second spacer 132 and improve safety.
  • the porosity of the second spacer 132 is greater than or equal to the porosity of the first spacer 131 .
  • Porosity refers to the percentage of pore volume in a bulk material to the total volume of the material in its natural state.
  • the test method of porosity is the true density test method.
  • the second separator 132 has better ion permeability, so as to reduce the blocking of ions by the second separator 132 and ensure the capacity of the electrode assembly 100 .
  • the porosity of the second spacer 132 is greater than that of the first spacer 131 .
  • At least the second spacer 132 is provided between the innermost adjacent first pole piece 110 and the second pole piece 120 .
  • the innermost first pole piece 110 and the second pole piece 120 are more prone to lithium deposition and burrs.
  • the curvature of the innermost bent portion 150 of the first pole piece 110 is larger, and the stress it receives is also larger. Therefore, the first pole piece The phenomenon that the active material of the innermost bending portion 150 of 110 falls off is relatively serious, and burrs are more likely to be generated.
  • the curvature of the innermost bent portion 150 of the second pole piece 120 is larger, and the stress it receives is also larger. Therefore, the second pole piece The phenomenon that the active material of the innermost bending portion 150 of 120 falls off is relatively serious, and burrs are more likely to be generated.
  • the second separator 132 can be installed in the area where the problem of lithium analysis is serious, so as to effectively reduce the short circuit problem of the electrode assembly 100 caused by the damage of the separator, and improve the service life and safety of the electrode assembly 100 .
  • the bending region B is provided with a plurality of second spacers 132 , and adjacent second spacers 132 are separated by the first pole piece 110 or the second pole piece 120 .
  • the thickness of the inner second spacer 132 is greater than the thickness of the outer second spacer 132 .
  • the curvature of the bending portion 150 gradually decreases from the inside to the outside, and the stress on the bending portion 150 also gradually decreases; that is, in the bending area B, the inner bending portion 150 appears
  • the problem of lithium deposition is more serious than the problem of lithium deposition at the outer bending portion 150 .
  • the inner second spacer 132 has a greater thickness to minimize the risk of being punctured; the outer second spacer 132 has a low risk of being punctured, so it can have a smaller thickness.
  • the thickness of the second spacer 132 is reduced to increase the energy density of the electrode assembly 100 .
  • the plurality of second spacers 132 are independently disposed.
  • the position of each second spacer 132 can be freely set as required.
  • the electrode assembly 100 further includes a straight region C connected to the bent region B, and both ends of the second separator 132 along the winding direction X are located in the straight region C.
  • the straight region C is a region where the electrode assembly 100 has a straight structure, and both the first pole piece 110 and the second pole piece 120 include a plurality of straight portions 160 located in the straight region C.
  • the straight portion 160 in the straight region C is substantially straight, for example, the straight portion 160 is generally flat.
  • At least one bending area B is provided with a second spacer 132 ; optionally, both bending areas B are provided with a second spacer 132 .
  • the second spacer 132 can completely separate the first pole piece 110 from the second pole piece 120 to improve safety.
  • the second spacer 132 is attached to the outer surface of the first spacer 131 .
  • the second spacer 132 may be entirely attached to the first spacer 131 , or may be only partially attached to the first spacer 131 . Exemplarily, both ends of the second spacer 132 along the winding direction X are attached to the first spacer 131 .
  • the second spacer 132 is attached to the first spacer 131, which can reduce the risk of second spacer 132 shifting and dislocation along the winding direction X during the charging and discharging process, and ensure that the second spacer 132
  • the protective effect of 132 in the bending area B improves safety.
  • the first spacer 131 When the first spacer 131 is bent, its inner surface is compressed and its outer surface is stretched. If the second spacer 132 is attached to the inner surface of the first spacer 131, the second spacer 132 may be in the first spacer. Wrinkles appear under the influence of the spacer 131, affecting the transmission of ions. In this embodiment, the second spacer 132 is attached to the outer surface of the first spacer 131 , and the second spacer 132 is stretched under the action of the first spacer 131 , so that the risk of wrinkling of the second spacer 132 can be reduced.
  • the inside and the outside are relative to the winding center of the electrode assembly 100 , the side facing the winding center is the inside, and the side away from the winding center is the outside. That is to say, the surface of the first spacer 131 facing the winding center is an inner surface, and the surface facing away from the winding center is an outer surface.
  • the second spacer 132 is bonded to the outer surface of the first spacer 131 by thermocompression.
  • the material of the first spacer 131 and the second spacer 132 can be PP (polypropylene) or PE (polyethylene).
  • PP polypropylene
  • PE polyethylene
  • the first separator 131 can be PP (polypropylene) or PE (polyethylene), and the second separator 132 can be polypropylene/UHMWPE diaphragm/epoxy resin composite diaphragm, porous One of poly-coagulation separators, coaxial composite nanofiber membranes, porous separators, glass fiber battery separators, and PVDF-HFP polymer electrolyte separators.
  • the polypropylene/UHMWPE diaphragm/epoxy resin composite diaphragm can improve the porosity and heat resistance of the diaphragm.
  • Porous polymeric membranes can combine gas permeability and puncture strength.
  • the coaxial composite nanofiber membrane is composed of composite nanofibers containing fluorine-containing desperate skin layer and polyimide core layer, which can not only ensure excellent wettability, liquid retention and ion conductivity, but also have high mechanical strength and heat resistance performance.
  • Porous membranes prepared by mixing polyolefins with silica or other inorganic substances.
  • Glass fiber battery separator composed of alkali-free glass fiber, PET (polyester), PA (polyamide). With this setting, the puncture resistance and mechanical strength of the second separator 132 are greater, and the inhibitory effect on lithium dendrites is stronger.
  • the second spacer 132 includes a plurality of spacer layers 1321 stacked along the thickness direction of the second spacer 132 .
  • the multi-layer structure can increase the strength of the second spacer 132, increase the difficulty of the second spacer 132 being punctured, and improve safety.
  • adjacent isolation layers 1321 are bonded to each other.
  • the isolation layers 1321 are represented by lines; although there are gaps between the isolation layers 1321 in the figure, actually adjacent isolation layers 1321 can be attached and bonded.
  • the plurality of isolation layers 1321 are bonded together, which can reduce the risk of offset between the plurality of isolation layers 1321 during the winding process of the electrode assembly 100, and ensure that the second separator 132 is bent Protective effect of area B.
  • the plurality of isolation layers 1321 may be bonded together by heat and pressure.
  • the material of the isolation layer 1321 is the same as that of the first isolation member 131 , and the thickness of the isolation layer 1321 is equal to the thickness of the first isolation member 131 .
  • first spacer 131 and the second spacer 132 can be made of spacers of the same specification, which can simplify the process and reduce the cost.
  • FIG. 6 is a schematic diagram of a partial structure of an electrode assembly provided by another embodiment of the present application.
  • the plurality of isolation layers include a first isolation layer 132a and a second isolation layer 132b adjacently arranged, and the first isolation layer 132a is located between the second isolation layer 132b and the first isolation member 131. between. In the winding direction X, the end of the second isolation layer 132b is offset from the end of the first isolation layer 132a.
  • the dislocation means that the end of the second isolation layer 132 b does not overlap with the end of the first isolation layer 132 a in the thickness direction of the second isolation member 132 .
  • two isolation layers in the plurality of isolation layers are respectively the first isolation layer 132a and the second isolation layer 132b.
  • Both ends of the first isolation layer 132a along the winding direction X are respectively defined as a first end and a second end, and both ends of the second isolation layer 132b along the winding direction X are respectively defined as a third end and a fourth end.
  • the third end is closer to the first end than the fourth end, and the fourth end is closer to the second end than the third end.
  • first end and the third end are arranged in an offset along the winding direction X.
  • the second end and the fourth end can be arranged in alignment along the winding direction X, or can be arranged in a dislocation along the winding direction X.
  • the first pole piece 110 and the second pole piece 120 expand and press the first isolation layer 132a and the second isolation layer 132b. If the end of the first isolation layer 132a and the end of the second isolation layer 132b are aligned, then the end of the first isolation layer 132a and the end of the second isolation layer 132b will press the same position of the pole piece, causing stress concentration , affecting the performance of the pole piece.
  • the end of the second isolation layer 132b and the end of the first isolation layer 132a are dislocated, so that the end of the second isolation layer 132b and the end of the first isolation layer 132a can press different regions of the pole piece , reduce stress concentration, reduce the risk of pole piece cracking, and improve the performance of the pole piece.
  • both ends of the second isolation layer 132b exceed the first isolation layer 132a and are attached to the first isolation member 131 .
  • the first isolation layer 132a may be independently disposed between the second isolation layer 132b and the first isolation member 131 , or may be attached to the second isolation layer 132b or the first isolation member 131 .
  • the second isolation layer 132b is attached to the first isolation member 131, and can restrict the movement of the first isolation layer 132a in the winding direction X, so that the first isolation layer 132a can be lowered during the charging and discharging process.
  • the risk of displacement and dislocation of the second isolation layer 132b along the winding direction X ensures the protective effect of the second isolation member 132 in the bending area B and improves safety.
  • the first isolation layer 132a is attached to the first isolation member 131 .
  • the first isolation layer 132a may be attached to the first isolation member 131 as a whole, or only partially attached to the first isolation member 131 . Exemplarily, both ends of the first isolation layer 132 a along the winding direction X are attached to the first isolation member 131 .
  • This embodiment can reduce the risk of displacement and dislocation of the first isolation layer 132a along the winding direction X, ensure the protective effect of the first isolation layer 132a in the bending area B, and improve safety.
  • Fig. 7 is a schematic diagram of a partial structure of an electrode assembly provided by some other embodiments of the present application.
  • the electrode assembly 100 further includes a straight region C connected to the bent region B.
  • the first isolation layer 132a is located in the bending area B as a whole. Both ends of the second isolation layer 132b along the winding direction X are located in the straight region C.
  • the first isolation layer 132a and the second isolation layer 132b can play a protective role in the bending area B at the same time, so as to reduce the risk of short circuit and improve safety.
  • the first isolation layer 132a is entirely located in the bending region B, which can prevent the first isolation layer 132a from affecting the transmission of ions in the flat region C, and ensure the charging and discharging performance of the flat region C.
  • Both ends of the second isolation layer 132b along the winding direction X are located in the straight region C, so that the ends of the second isolation layer 132b and the ends of the first isolation layer 132a can be misaligned to reduce stress concentration.
  • the end of the first isolation layer 132 a along the winding direction X is located at the junction of the straight region C and the bent region B.
  • Fig. 8 is a schematic diagram of a partial structure of an electrode assembly provided in some further embodiments of the present application.
  • the second pole piece 120 is a negative pole piece, and the second separator 132 is attached to the outer surface of the second pole piece 120 .
  • the second spacer 132 is attached to the outer surface of the second pole piece 120, and the second spacer 132 is stretched under the action of the second pole piece 120, which can reduce the wrinkle of the second spacer 132. risk.
  • the diameter of the positive pole piece outside the negative pole piece is greater than the diameter of the negative pole piece, so the area of the positive active material layer of the positive pole piece outside the negative pole piece is greater than the area of the negative active material layer of the negative pole piece , which causes the outer surface of the negative pole piece to be prone to lithium precipitation.
  • the second separator 132 is attached to the outer surface of the negative pole piece to reduce the risk of short circuit and improve safety.
  • FIG. 9 is a schematic flowchart of a method for manufacturing a battery assembly provided by some embodiments of the present application.
  • the manufacturing method of the battery assembly of the embodiment of the present application includes:
  • the polarity of the first pole piece and the second pole piece are opposite, and the first separator is used to separate the first pole piece and the second pole piece;
  • the separators are laminated and used to separate adjacent first and second pole pieces; at least part of the ions released from the first pole piece can pass through the first and second separators and be embedded in the second pole piece.
  • Fig. 10 is a schematic block diagram of an electrode assembly manufacturing system provided by some embodiments of the present application.
  • a battery assembly manufacturing system 90 includes a providing device 91 and a winding device 92 .
  • the providing device 91 is used for providing the first pole piece, the second pole piece, the first spacer and the second spacer.
  • the winding device 92 is used to wind the first pole piece, the second pole piece and the first separator along the winding direction, and form a bending area.
  • the polarity of the first pole piece and the second pole piece are opposite, and the first spacer is used to separate the first pole piece and the second pole piece; the second spacer is provided in the bending area, and the second spacer and the first spacer stacked and used to separate the adjacent first pole piece and the second pole piece; at least part of the ions released from the first pole piece can pass through the first spacer and the second spacer and be embedded in the second pole piece.

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PCT/CN2022/073265 2021-09-10 2022-01-21 电极组件、电池单体、电池以及用电装置 WO2023035541A1 (zh)

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EP22866021.3A EP4325623A1 (en) 2021-09-10 2022-01-21 Electrode assembly, battery cell, battery and electric apparatus
JP2023543459A JP2024503520A (ja) 2021-09-10 2022-01-21 電極アセンブリ、電池セル、電池及び電力消費装置関連出願の相互参照
KR1020237024948A KR20230121906A (ko) 2021-09-10 2022-01-21 전극 조립체, 전지 셀, 전지 및 전기 장치
CN202280005318.1A CN116114095A (zh) 2021-09-10 2022-01-21 电极组件、电池单体、电池以及用电装置
US18/353,679 US20230361429A1 (en) 2021-09-10 2023-07-17 Electrode assembly, battery cell, battery, and electrical apparatus

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1244952A (zh) * 1997-11-19 2000-02-16 三菱电机株式会社 锂离子二次电池和其制造方法
JP2011008929A (ja) * 2009-06-23 2011-01-13 Panasonic Corp 非水系二次電池用電極群およびこれを用いた非水系二次電池
CN205992575U (zh) * 2016-07-21 2017-03-01 中航锂电（洛阳）有限公司 正极片和卷绕式锂离子动力电池电芯及锂离子动力电池
CN110249473A (zh) * 2017-02-24 2019-09-17 三洋电机株式会社 非水电解质二次电池
CN110364769A (zh) * 2019-07-31 2019-10-22 瑞浦能源有限公司 一种卷绕电芯及电池
CN214706007U (zh) * 2021-03-25 2021-11-12 瑞浦能源有限公司 卷绕电芯及电池

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001229970A (ja) * 2000-02-16 2001-08-24 Shin Kobe Electric Mach Co Ltd 円筒形リチウムイオン電池
CN100429822C (zh) * 2005-01-14 2008-10-29 比亚迪股份有限公司 锂离子电池的电极片芯及含有该电极片芯的锂离子电池
KR100646535B1 (ko) * 2005-03-23 2006-11-23 삼성에스디아이 주식회사 리튬 이온 전지용 전극조립체와 이를 이용한 리튬 이온이차전지
CN2798320Y (zh) * 2005-04-18 2006-07-19 比亚迪股份有限公司 碱性二次电池的电极芯及含有该电极芯的碱性二次电池
JP5147206B2 (ja) * 2006-08-11 2013-02-20 三洋電機株式会社 非水電解質二次電池
JP5274059B2 (ja) * 2008-03-13 2013-08-28 日立ビークルエナジー株式会社 捲回式電池の製造方法
CN102487150B (zh) * 2010-12-03 2014-10-08 比亚迪股份有限公司 电池电芯的卷绕方法及装置
JP6095961B2 (ja) * 2011-12-06 2017-03-15 株式会社半導体エネルギー研究所 角形リチウム二次電池
JP6139072B2 (ja) * 2012-07-31 2017-05-31 太陽誘電株式会社 電気化学デバイス及びその製造方法
JP6094807B2 (ja) * 2013-04-26 2017-03-15 株式会社Ｇｓユアサ 渦巻状電極群を備える電池
JP2015153454A (ja) * 2014-02-10 2015-08-24 トヨタ自動車株式会社 非水電解質二次電池
CN106129483B (zh) * 2016-08-23 2019-04-19 宁德新能源科技有限公司 一种卷绕式电芯
JP6183526B2 (ja) * 2016-09-23 2017-08-23 株式会社Ｇｓユアサ 蓄電素子
WO2018061971A1 (ja) * 2016-09-30 2018-04-05 ブラザー工業株式会社 電池
CN206379432U (zh) * 2016-12-27 2017-08-04 宁德时代新能源科技股份有限公司 二次电池卷绕式电芯
JP6510573B2 (ja) * 2017-02-10 2019-05-08 太陽誘電株式会社 蓄電素子
CN109802164B (zh) * 2017-11-17 2021-10-01 青海时代新能源科技有限公司 卷绕式电极组件制造装置
CN207572477U (zh) * 2017-12-12 2018-07-03 宁德时代新能源科技股份有限公司 电极组件和二次电池
US20200036034A1 (en) * 2018-07-24 2020-01-30 Michael Wang High-capacity polymer lithium-ion battery structure
CN209389153U (zh) * 2019-03-20 2019-09-13 三星(天津)电池有限公司 一种卷绕结构的锂离子电池
CN212810367U (zh) * 2020-08-21 2021-03-26 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池和用电装置
BR112022017318A2 (pt) * 2020-08-21 2023-03-07 Contemporary Amperex Technology Co Ltd Conjunto de eletrodos, célula de bateria, bateria e aparelho elétrico
CN214254496U (zh) * 2021-01-19 2021-09-21 宁德时代新能源科技股份有限公司 电极组件、电池单体、电池以及用电装置
CN112467231B (zh) * 2021-02-04 2021-09-14 江苏时代新能源科技有限公司 电极组件、电池单体、电池及电极组件的制造方法和设备
CN112803081B (zh) * 2021-04-14 2021-08-06 江苏时代新能源科技有限公司 一种电池单体及其制备方法、电池及用电装置
CN216773319U (zh) * 2022-01-27 2022-06-17 宁波容百新能源科技股份有限公司 一种裸电芯及锂电池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1244952A (zh) * 1997-11-19 2000-02-16 三菱电机株式会社 锂离子二次电池和其制造方法
JP2011008929A (ja) * 2009-06-23 2011-01-13 Panasonic Corp 非水系二次電池用電極群およびこれを用いた非水系二次電池
CN205992575U (zh) * 2016-07-21 2017-03-01 中航锂电（洛阳）有限公司 正极片和卷绕式锂离子动力电池电芯及锂离子动力电池
CN110249473A (zh) * 2017-02-24 2019-09-17 三洋电机株式会社 非水电解质二次电池
CN110364769A (zh) * 2019-07-31 2019-10-22 瑞浦能源有限公司 一种卷绕电芯及电池
CN214706007U (zh) * 2021-03-25 2021-11-12 瑞浦能源有限公司 卷绕电芯及电池

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